CMB Constraint on Dark Matter Annihilation after Planck 2015
Masahiro Kawasaki, Kazunori Nakayama, Toyokazu Sekiguchi
TL;DR
This paper refines constraints on dark matter annihilation by analyzing Planck 2015 CMB data, explicitly modeling the effects of annihilation products on hydrogen ionization and heating without assumptions on energy fractions.
Contribution
It provides a comprehensive calculation of dark matter annihilation effects on the CMB, improving the accuracy of constraints without relying on prior assumptions.
Findings
Stronger limits on dark matter annihilation cross section.
Detailed modeling of annihilation product cascades.
No reliance on fixed energy fraction assumptions.
Abstract
We update the constraint on the dark matter annihilation cross section by using the recent measurements of the CMB anisotropy by the Planck satellite. We fully calculate the cascade of dark matter annihilation products and their effects on ionization, heating and excitation of the hydrogen, hence do not rely on any assumption on the energy fractions that cause these effects.
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